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Old 02-24-2012, 04:24 PM   #1
CrankyOldMan
2ZR swap. DO IT! Ask how!
 
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Drives: 09 Meteoric Metallic HB
Join Date: Feb 2011
Location: West Michigan
Posts: 2,333
C-series transmission component comparison - LOTS OF PICS

tl;dr - You can put different gear and final drive ratios in a Yaris C50 5-speed gearbox. Buying a complete used gearbox is the easiest starting point. It is NOT cheap, but is a good CARB legal way to get better performance.

Full story - In the process of exploring the possibilities of swapping gears into the Yaris from various donors, I've made some important discoveries. I'll try to add pics whenever possible/reasonable to help clarify. These aren't in any particular order, just what I'm documenting at the moment.

The transmissions in question are:
  • '09 Yaris C50 5-speed manual
  • '03 Celica C56 5-speed
  • '07 Matrix C59 5-speed
  • '05 xB C50 5-speed

1. The bell housings are NOT the same, even the xB and Yaris have different part numbers despite having the "same" transmission name. The only real difference is the presence/absence of the mounting points, so if you can fab custom mounts this might not be a deal breaker.





2. The gearbox housings are NOT the same, again even the xB and Yaris. According to the EPC, '10 and newer Matrix/Corolla/Vibe will have the correct gearbox housing, but the bell housing is different. The main difference is the presence/absence of the front hole where the shift control lever exits. If you can machine the hole with reasonable accuracy (knee mill, CNC, etc) then it may be possible to make do with a different gearbox.



There is also a small pin/bolt on the shift control rod housing that is ONLY present on the Yaris C50. I'm not sure of what it does. The other 2 are not shown because they are identical to the xB.



3. The end caps are basically the same--if not identical--for all of these transmissions.



4. The output shafts are interchangeable between the C56 and C50, provided that you have the correct bearing in the bell housing. The C56 uses an inner race for the roller bearing that clips in place on the output shaft, so it has a different bearing.

5. 1st, 2nd and reverse are all part of the input shaft. If you want a different ratio for 1st, you have to swap the entire input shaft. All of these 5-speed boxes have identical 2nd gear ratios. The final drive ratio is fixed on the pinion shaft. If you want a different final drive, you have to swap the pinion shaft.



More later...

Last edited by CrankyOldMan; 03-13-2017 at 11:37 AM.
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